Magnets aren't so easy to lose -- they stick with you. But we've seen countless borrowed bikes get returned with someone's computer magnet still fixed to the front wheel. Oops! This Cateye Magnet will work as a replacement for any brand of cycling computer as long as they rely on a spoke mounted magnet for the speed sensor. It works equally well for round or bladed spokes and can be mounted and removed without the need for tools of any sort.